@primer/css is a collection of CSS utility classes and components developed by GitHub's design system Primer. It provides a set of customizable and reusable styles for building modern and responsive web interfaces. The package includes utility classes for spacing, typography, colors, layout, and more, allowing developers to quickly style their applications without writing custom CSS from scratch.
Styled-jsx is a library that allows you to write scoped and component-specific CSS in your React components using a CSS-in-JS approach. It provides a way to style your components without worrying about global CSS conflicts, as styles are encapsulated within the component. Styled-jsx supports both inline styles and global styles, giving you flexibility in how you manage your styles.
Both @primer/css and styled-jsx are popular npm packages in the front-end development community. However, styled-jsx has gained more popularity due to its association with Next.js, a popular React framework.
Styling Approach
@primer/css is a utility-first CSS library that provides a set of pre-defined utility classes for styling components. It follows the CSS-in-JS approach and allows you to compose styles using JavaScript. On the other hand, styled-jsx is a CSS-in-JS solution that allows you to write component-scoped styles using a CSS-like syntax directly in your React components.
Integration with React
Both packages can be used with React, but styled-jsx has a tighter integration with React and is commonly used in Next.js projects. It provides a built-in CSS-in-JS solution and supports server-side rendering (SSR) out of the box. @primer/css can also be used with React, but it requires additional setup and configuration.
Performance
In terms of performance, @primer/css is optimized for performance and generates minimal CSS output by using utility classes. It leverages the power of static extraction and deduplication. styled-jsx also performs well, but it generates scoped CSS for each component, which can result in larger CSS bundles compared to @primer/css.
Developer Experience
styled-jsx provides a simple and intuitive syntax for writing component-scoped styles directly in your React components. It offers features like automatic vendor prefixing and supports dynamic styles using template literals. @primer/css, on the other hand, provides a set of utility classes that can be applied to components, making it easy to style components without writing custom CSS. Both packages have good documentation and community support.
Customization and Extensibility
styled-jsx allows you to customize and extend its functionality by using plugins and configuration options. You can also use CSS preprocessors like Sass or Less with styled-jsx. @primer/css, being a utility-first CSS library, provides a limited set of utility classes that can be customized to some extent, but it may not offer the same level of customization and extensibility as styled-jsx.
